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TA31275FN Datasheet(PDF) 7 Page - Toshiba Semiconductor |
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TA31275FN Datasheet(HTML) 7 Page - Toshiba Semiconductor |
7 / 25 page TA31275FN/ TA31275FNG 03-01-23 7 7. RF Amp Gain 2 RF amp gain 2 (Gv (RF) 2) is a reference value calculated as follows. Measure GRF in the following figure. Gv (RF) 2 is calculated as follows: Gv (RF) 2 = GRF − Gv (MIX) Figure 4 8. IF Amp Gain The intended value is 75dB. 9. Waveform-Shaping Output Duty Cycle The specified range of electrical characteristics is only available for single-tone. 10. Local Frequency Range (after multiplying frequency by 8) When the multiplier circuit is used, the local frequency will be in the range 250.7 MHz to 439.3 MHz. 11. Treatment of FM Terminal when Using AM When using AM, it is not necessary to treat the QUAD pin (pin 10). Leave it open or connected to an FM external circuit. To use the bit rate filter, connect the RSSI pin (pin 21) to the bit rate filter through a resistor. The AF-OUT pin (pin 22) should be left open. Figure 5 Figure 6 Using AM causes current to flow through the AM/FM pin (pin 19). Ground the AM/FM pin (pin 19) or connect it to the BS pin (pin 9). AF OUT RSSI Bit rate filter for FM 22 21 1000 pF 4 6 18 16 13 0.01 µF SG 50dB µV GRF 6 pF 1000 pF 0.01 µF 21 22 AF OUT RSSI Bit rate filter for AM 36 k Ω |
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